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Optimization design of excitation strategy on vibrating wire sensor

机译：振动线传感器激励策略优化设计

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摘要

There are two ways of excitation on steel-string sensor—high-voltage plucked excitation or low-voltage scanning frequency excitation. But both of them have disadvantages. The disadvantages of high-voltage plucked excitation are that it has a large damage to sensor, the signals got through this way attenuate fast, and measurement accuracy of the signals is poor. On the other hand, low-voltage sweeping excitation scans a long time and signals got though this way are hard to catch. This paper proposes a kind of feedback type low excitation method, which is pre-excite a sensor with a lower voltage on plucked vibration, and use vibration frequency got from this way as output of the excitation driver to vibrate the sensor for the second time. Because the feedback signal frequency is approximate to the real one, the string can reach a resonance state in a very short time. The optimal excitation strategy is verified by a new designed exciting and measuring circuit. It is confirmed that resonance amplitude can be larger in a shorter excitation time by this way, and result in an enhanced anti-interference ability, reduced the cost of signal processing circuit, increased available measuring time and improved the accuracy of frequency measurement.
机译：钢串传感器 - 高压采集激励或低压扫描频率激发有两种激励方式。但他们两个都有缺点。高压采摘激励的缺点是它对传感器具有大量损坏，通过这种方式通过这种方式快速衰减，并且信号的测量精度差。另一方面，低压扫描激励扫描很长一段时间，并且通过这种方式难以捕获信号。本文提出了一种反馈型低励磁方法，其预先激发了具有较低电压的碰撞振动的传感器，并且使用振动频率从这种方式获得，因为激励驱动器的输出第二次振动传感器。因为反馈信号频率近似于真实的，所以字符串可以在很短的时间内达到谐振状态。通过新的设计励磁和测量电路验证了最佳激励策略。通过这种方式，确认谐振幅度可以在较短的激发时间内更大，并且导致抗干扰能力增强，降低了信号处理电路的成本，增加了可用的测量时间并提高了频率测量的精度。

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